package servlet;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;


@WebServlet("/logout")
public class LogOutServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        HttpSession session =req.getSession(false);
        if (session == null) {
            // 当前就是未登录的状态，那么直接跳转到blog_login.html 页面
            resp.sendRedirect("blog_login.html");
            return;
        }

        // 如果有Session那么就是把之前登录成功后的user对象给删掉
        session.removeAttribute("user");

        resp.sendRedirect("blog_login.html");
    }
}
